// @ts-nocheck

/*
object-assign
(c) Sindre Sorhus
@license MIT
*/

'use strict';

/* eslint-disable no-unused-vars */
var getOwnPropertySymbols = Object.getOwnPropertySymbols;
var hasOwnProperty = Object.prototype.hasOwnProperty;
var propIsEnumerable = Object.prototype.propertyIsEnumerable;

function toObject(val) {
  if (val === null || val === undefined) {
    throw new TypeError('Object.assign cannot be called with null or undefined');
  }

  return Object(val);
}

function shouldUseNative() {
  try {
    if (!Object.assign) {
      return false;
    }

    // Detect buggy property enumeration order in older V8 versions.

    // https://bugs.chromium.org/p/v8/issues/detail?id=4118
    var test1 = new String('abc'); // eslint-disable-line no-new-wrappers
    // @ts-ignore
    test1[5] = 'de';
    if (Object.getOwnPropertyNames(test1)[0] === '5') {
      return false;
    }

    // https://bugs.chromium.org/p/v8/issues/detail?id=3056
    var test2 = {};
    for (var i = 0; i < 10; i++) {
      test2['_' + String.fromCharCode(i)] = i;
    }
    var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
      return test2[n];
    });
    if (order2.join('') !== '0123456789') {
      return false;
    }

    // https://bugs.chromium.org/p/v8/issues/detail?id=3056
    var test3 = {};
    'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
      test3[letter] = letter;
    });
    if (Object.keys(Object.assign({}, test3)).join('') !== 'abcdefghijklmnopqrst') {
      return false;
    }

    return true;
  } catch (err) {
    // We don't expect any of the above to throw, but better to be safe.
    return false;
  }
}

const assign = shouldUseNative()
  ? Object.assign
  : function (target, source) {
      var from;
      var to = toObject(target);
      var symbols;

      for (var s = 1; s < arguments.length; s++) {
        from = Object(arguments[s]);

        for (var key in from) {
          if (hasOwnProperty.call(from, key)) {
            to[key] = from[key];
          }
        }

        if (getOwnPropertySymbols) {
          symbols = getOwnPropertySymbols(from);
          for (var i = 0; i < symbols.length; i++) {
            if (propIsEnumerable.call(from, symbols[i])) {
              to[symbols[i]] = from[symbols[i]];
            }
          }
        }
      }

      return to;
    };

export default assign;
